If you like searching several of the popular airline ticketing sites when you're looking for cheap tickets, Google's integrated a nice feature into their search that identifies when you may be looking for tickets and provides direct links to searches on sites like CheapTickets, Expedia, Hotwire, Orbitz, Priceline, and Travelocity—like this search fro San Francisco to Tokyo.

Granted, Google's got some of the good ones left out (I'm rather partial to Kayak), but it's a nice way to get a quick overview from the Google search box. This may not be entirely new to Google (it's definitely not new to Yahoo), but it was news to me. Thanks Jason!